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URL: https://oeis.org/A330659

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A330659
The number of free polyiamonds with n cells on an order-7 triangular tiling of the hyperbolic plane.
4
1, 1, 1, 1, 3, 4, 12, 27, 78, 208, 637, 1870, 5797, 17866, 56237, 177573, 566904, 1818527, 5874180, 19065038
OFFSET
0,5
COMMENTS
This gives the number of polyforms with n cells in the hyperbolic tiling with Schläfli symbol {3,7}.
This sequence is computed from via program by Christian Sievers in the Code Golf Stack Exchange link.
PROG
Several working programs are available via the Code Golf link.
CROSSREFS
Analogs with different Schläfli symbols are A000207 ({3,oo}), A000577 ({3,6}), A005036 ({4,oo}), and A119611 ({4,5}).
Sequence in context: A000942 A255436 A197459 * A393722 A000207 A002986
KEYWORD
nonn,more
AUTHOR
Peter Kagey, Mar 01 2020
EXTENSIONS
a(11)-a(19) from Ed Wynn, Feb 14 2021
STATUS
approved